Casing-jack.



I H. G. PEAKE.

CASING JACK. APPLICATION IHLED JUNE 7,1915.

Patentd Feb. 1916.

I INVENTOR Early gfeafl;

WITNESSES:

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HARRY G. PEAKE, OF SAN FRANCISCO, CALIFORNIA.

' CASING-JACK.

able clutch or gripping member adapted'to'" embrace the pipe or casingto be removed.

Another object of the invention is to provide a toggle lever mechanism,whereby the movable gripping member is operated, and to provide meansfor automatically and successively engaging and releasing the grippingmembers while the pipe or casing is being lifted. I

Further objects will hereinafter more fully appear.

The invention consists of the parts and the construction and combinationof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings, in which Figure 1 is a sideelevation of the casing jack. Fig. 2 is a cross section on line 22 ofFig, 1.

The jack proper consists of a stationary base member A in which isformed a central opening 2. Pivotally mounted, as at 3, is

one member 4 of a toggle link, and formed integrally with said member isa lever 5. Pivotally attached, as at 6, to the link member 4 is a secondlink 7, the upper end of which is pivotally attached to a movablecollar8in which is formed a central opening 9. Two or more levers 5,with connected toggle links 4 and 7, may be interposed between thestationary base section A. and the movable collar 8 and these levers maybe operated by any suitable means, or, as here shown, by a bridleconnection 9 which may be raised or lowered by the cable 10 and anysuitable mechanism not here shown.

Loosely mounted in guide slots, formed around the central opening .2 inthe lower base section, is a plurality of wedge-shaped gripping members12, and similarly mounted in the upper collar 8 is a plurality ofwedgeshaped gripping members 13.

In operation, when it is desired to remove a pipe or casing, such asindicated at 14,

I Specification of Letters Patent. Application filed June 7, 1915."Serial No. 32,611.

Patented Feb. 8, 1916.

from a well, itfis only necessary to slip the ack over the upper. end ofthe casing, as indicated inFig. 1, and support'same on a pair of timbersas shown in Fig. 1 or like means. The levers 5 are then raised andlowered by means of the bridle 9 and cable 10 and .an upward movement ofthe levers will force the toggle links inwardly against the casing14,causing the collar 8 to be movedin an upward direction. The wedges 13will in this manner grip the pipe and causethe latter to beraisedinunison with the collar 8; the lower wedges 12 being inactive during theupward movement of the collar 8. The moment the levers 5 are lowered thecollar 8 will also be lowered, together with the gripping. wedges 13.The lower wedges 12 will then be forced into engagement with the casing,if this has a tendency to settle, and thus rip and lock it from droppingor settling own.

A jack constructed ashere shown has the advantage of pulling/the casingfrom the ground more rapidly than the ordinary method. It, furthermore,prevents any injury to the threads and. couplings on the casing. Theusual method of pulling a casing is with the pulling jar, which isvirtually a hammer striking an upward blow on the inside of a cap whichis screwed on the top length of a casing. This constant ham-f mering hasa tendency to crystallize the metal in the pipe, and it is not anuncommon occurrence to have the thread portion break off. The devicehere shown entirely eliminates this feature as the'pull is constant. Thejack also eliminates any possibility of the pipe slipping back into thehole, as the wedges in the lower member A prevent this;

7 s'rrs PATENT Enronconsequently any gain made in pulling the Y pipe isretained. This isiof great assistance when the pipehas been driventhrough clay. This material being more or less springy, the pipe mayeasily be brought up, say, onequarter of an inch by a blow from thepulling jar, but before another blow is struck, it settles back into itsoriginal position.

The jack is simple and substantial in construction and, easy to. operateand can be readily moved about from place to place when needed. 1

The materials and finish of the several 1 I wish it understood thatvarious changes in form, proportions and details of construction may berestorted to within the scope of the appended claims, and'that I do notwish to limit myself to the specific design and construction here shown.

Having thus described my invention, what I claim and 'desirelto secureby Letters Patent is 1. In a jack, a base and a top member spaced abovethe base and each apertured to receive a pipe, a pair of toggle linkscomprising short parts pivoted to the base at their lower ends andangular lever extending out from said short parts, and vertical linkspivoted at the lower ends to the upper ends of the short parts and tothe top member and normally diverging at their lower ends whereby uponupward movement of the levers the vertical links will be moved inwardlyat their lower ends 'to thus move the top member upwardly.

2. In a pipe jack, an upper movable member and a lower statlonarymember, a pair of means to ralse the upper member located on oppositesides of the members and connected thereto, actuating means for each ofwitnesses.

HARRY G. PEAKE. Witnesses:

R. H. BLACK,

J. C. LUTGEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, IMO."

